I'm not sure when or how this bug is triggered, so I don't know when you would need to revert back to to have a good chance of avoiding it again. Personally I would try reloading if you have a save where you would only need to redo about 10 or 15 minutes of gameplay, but there is no guarantee that going back farther and replaying an hour or two, for example, would help.
When the
Divinity Anthology was released it included an updated version of Divinity 2: the Dragon Knight Saga (DKS), called Divinity 2: Developer's Cut (D2:DC). Some digital distributors updated everyone that had previous versions of Divinity 2 to have D2:DC automatically. For other places, or retail versions of the game, Larian offered a free download version from the
Larian Vault (see
here for details).
Support wouldn't get back to you until next week, but if you did get the upgrade you would be able to continue with your existing save.
